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An essential.

If your undershirt collection's been looking ragged for longer than you'd like to admit, replace those stained, stretched-out shirts with the Under Amour Core Crew Short-Sleeve 2-Pack. You'll gain two breathable, moisture-wicking tops to replace your cotton ones, each with a form-fitting cut for easy layering. Under Armour even added an odor-resistant treatment to the fabric for the days the laundry pile is overflowing and you don't have time to take care of it. Stock up.